gdcmscu: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/gdcmscu - from package: libgdcm-tools

You may install the required package with command apt-get install {package}

Error in other languages:
gdcmscu: bevel nie gevind nie
gdcmscu: comandă negăsită
gdcmscu: comando não encontrado
gdcmscu: commande introuvable
gdcmscu: command not found
gdcmscu: käsku ei ole
gdcmscu: không tìm thấy lệnh
gdcmscu: komanda nerasta
gdcmscu: Kommando nicht gefunden.
gdcmscu: kommandot finns inte
gdcmscu: komut yok
gdcmscu: nie znaleziono polecenia
gdcmscu: níor aimsíodh an t-ordú
gdcmscu: no se encontró la orden
gdcmscu: no s'ha trobat l'ordre
gdcmscu: opdracht niet gevonden
gdcmscu: parancs nem található
gdcmscu: perintah tidak ditemukan
gdcmscu: príkaz nenájdený
gdcmscu: příkaz nenalezen
gdcmscu: команда не найдена
gdcmscu: командата не е открита
gdcmscu: 命令找不到
gdcmscu: コマンドが見つかりません